Patent GB-1211809-A (GB)
Title: Improvements relating to machines for running together bevel or hypoid gears
IPC: G01M13/02
Filed: 1968-08-08
Abstract: 1,211,809. Lapping gears. GLEASON WORKS. 8 Aug., 1968 [29 Sept., 1967], No. 37918/68. Heading B3D. [Also in Divisions F2 and G1] A machine for running together a pair of gears P, G for smoothing or finishing them by lapping, honing or burnishing comprises a frame 20, a spindle (22), Fig. 3 (not shown) carrying the gear G, a spindle 28 carrying the gear 7, supports (21) and 38, 41 for the spindles, means for axially adjusting the spindles and for varying the relative positions of the spindle axes in a direction perpendicular to the axes, clamps 77, 75 for securing the supports to the frame and means for axially displacing the spindle 28 while the gears are running in mesh. The gears may both be work gears or one may be a master gear or a gear shaped tool. The means for axially adjusting the spindle (22) consists of a hand wheel 69 which is connected by gearing to the housing (21) for the spindle. The spindle 28 is mounted in a housing 32 which is pivotable about a shaft 36 mounted in the support 38. The support 38 consists of a slide movable along guides 39 in the lower support 41 which is also a slide movable along guides 42, 43. A hand wheel 62 moves the slide 41 to adjust the amount of offset of the axes 24, 31 of the gears, the amount of offset being shown on an indicator 64. When the gears have been adjusted in position the clamps 75 controlled by a lever 74 secure the slide 38 to the slide 41, clamps 76 controlled by a lever 80 secure the slide 41 to the frame 20 and the clamps 77 secure the support (21) to the frame. The clamps are spring applied but are hydraulically released. The gears P and G are rotated by motors M1 and M2 respectively via pulleys and belts, either motor serving as a drive motor and the other as a brake. An hydraulic actuator 44 is provided to pivot the housing 32 to enable the gears to be assembled and also to establish a predetermined back lash between the gears. The actuator 44 pivots the housing 32 about the shaft 36 whereupon release of the hydraulic pressure allows the housing to return under gravity by an amount determined by the setting on a backlash dial 133. A gauge 138 previously zeroed with master gears having the correct back lash indicates the distance by which the test gear G should be adjusted along its axis by shims. During the running together of the gears P, G hydraulically released clamps 161 secure projections 35 of the housing 32 to the shaft 36 whilst clamps 162 secure flanges 165 having shafts 163 to bearing blocks 187 on the slide 38. For determining the best or quietest running position of the gear P it is necessary to provide a small axial adjustment of the gear P whilst the gears are running. For this purpose a cam 201 having a helical surface is mounted on the shaft 36 and biased by a spring 207 towards a roller 203 journalled on a stud secured to the housing 32. Rotation back and forth of a hand wheel 211 causes rotation of the cam 201 to reciprocate the housing 32 and the shafts 36, 163 in bearings 37, 183 in search of the quietest running position.